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<DIV>Lance,</DIV>
<DIV> </DIV>
<DIV>I agree that the OS160 carb was not designed for positive pressure fuel
supply...that may be why so many with the perry setup have to screw the low end
all the way in and end up with the high needle at only 1 to 1-1/2 turns
out. Recently however, I have tried the perry setup using an overflow back
to the tank. This is simply a tee in the line between the pump and the
needle valve that feeds back to the tank. Any more fuel than the carb asks
for now goes back to the tank....sort of like a regulator rather than a pump
(iron bay?). My high needle is now at 2 turns out and the low needle is at
the factory setting....plus the mid range is not indicating any rich
tendencies. We'll see how it holds up over time...for now it's good.</DIV>
<DIV> </DIV>
<DIV>-mark</DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=patterndude@comcast.net href="mailto:patterndude@comcast.net">Lance
Van Nostrand</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, November 04, 2006 6:07
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] o.s. 1.60
backplate fuel pump ?</DIV>
<DIV><BR></DIV>
<DIV>Jon,</DIV>
<DIV>I first saw a built in pump overheat on a Webra 145 in Lubbock (3000ft)
on a 104 degree day. After that I convinced the Mintor folks to install
a nylon isolator/insulator. They eventually got it done right (their
first attempt leaked) and sent me test results of the engine running in 160
degree ambient. My concern with the perrys is that they seem to work for
a while, then need adjustment. now I know there are probably a lot that
have found them rock solid, but my observations are otherwise. I know
several that have had much better luck placing the tank on the firewall and
eliminating the pump for the 160. in my observations, if I were to use a
160, this is what I'd do. The 160 was not really designed for a pump and
has a small venturi with a lot of suction and doesn't need a pump.
Engines designed with a pump in mind might not be able to get away without
one.</DIV>
<DIV>--Lance</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=JonLowe@aol.com href="mailto:JonLowe@aol.com">JonLowe@aol.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, November 04, 2006 11:49
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] o.s.
1.60 backplate fuel pump ?</DIV>
<DIV><BR></DIV>
<DIV>
<DIV>
<DIV>In a message dated 11/4/2006 1:01:33 AM Central Standard Time, <A
href="mailto:toneuf@sbcglobal.net">toneuf@sbcglobal.net</A> writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid">
<DIV><FONT face=Arial>Guys,</FONT></DIV>
<DIV><FONT
face=Arial>
OK, I got into this discussion late... </FONT></DIV>
<DIV><FONT face=Arial> I am trying to
locate a backplate</FONT></DIV>
<DIV><FONT face=Arial> fuel pump
unit for <U>my O.S. 1.60 FX engine.</U></FONT></DIV>
<DIV><FONT face=Arial> I read the
infomation by Tom Koenig from last year, but still need the</FONT></DIV>
<DIV><FONT face=Arial> unit
contact information.</FONT></DIV>
<DIV><FONT face=Arial> Does this unit
acutally exist ?</FONT></DIV>
<DIV><FONT face=Arial> Maybe someone
out there has a unit to sell?</FONT></DIV>
<DIV><FONT face=Arial> If not, can
you give me the forward to this unit ?</FONT></DIV>
<DIV><FONT face=Arial>
Austrialia? Sheesh....</FONT></DIV>
<DIV><FONT
face=Arial>
Regards, Robert Hixson San
Francisco</FONT></DIV></BLOCKQUOTE></DIV>
<DIV>When I first heard about people doing this, I thought it was really
neat. Now, after thinking about it, I can't recommend doing
this. Many engines with backplate pumps have problems with the pumps
overheating, and vaporlocking or deteriorating. I've seen this on
Webras and Mintors, and watched the owners go to external Perry pumps.
Having the pump separate keeps its temp closer to ambient. Plus, you
can go to almost any hobby shop in the country, and buy a Perry pump off the
rack for $30, and not worry about having a hard to find spare in an
emergency. You can change it out without removing the engine if you
suspect a problem. Todays widebody pattern ships have plenty of room
in the nose, so mounting it is not an issue. In addition, a separately
mounted pump makes it much easier to adjust pressure as you are setting it
up, and it isn't subjected to all of the vibration of the engine.</DIV>
<DIV> </DIV>
<DIV>Just my opinion.</DIV></DIV>
<DIV> </DIV>
<DIV><FONT size=2 PTSIZE="10">Jon Lowe<BR></FONT></DIV>
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